Solar ultraviolet continuum radiation - The photosphere, the low chromosphere, and the temperature-minimum region

Details Solar ultraviolet continuum radiation - The photosphere, the low chromosphere, and the temperature-minimum region Solar ultraviolet continuum radiation - The photosphere, the low chromosphere, and the temperature-minimum region

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apjs...44..273s&link_type=abstract

Astrophysical Journal Supplement Series, vol. 44, Nov. 1980, p. 273-294. Research supported by the Centre National d'Etudes Spa

Astronomy and Astrophysics

Astrophysics

10

Continuous Radiation, Solar Atmosphere, Solar Flux Density, Solar Spectra, Solar Temperature, Ultraviolet Spectra, Atmospheric Models, Brightness Temperature, Chromosphere, Opacity, Photosphere, Radiation Distribution

Scientific paper

Solar disk-center intensity measurements are compared with theoretical values calculated for atmospheric models derived from the temperature distributions found by Vernazza et al (1976); generally good agreement is found with an atmospheric model having a minimum temperature of about 4150 K or possibly higher. Empirical opacity values including LTE departures and absorption coefficients which best represent the radiation field in the range 1460-2100 A are presented. It is shown that a contribution to the opacity from Fe I almost equal to the Si I opacity makes it possible to explain the observed center-to-limb contrast between 1525 and 1570 A and its fast change through 1570 A. However, the strong measured limb darkening as compared with the calculated variation from 1600 to 1682 A cannot completely be accounted for in terms of opacity and still preserve the agreement with the absolute center intensities.

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